Memory Backup Battery - HID Mercury LP1501 Installations And Specifications

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2.10 Relay circuit wiring
Two Form-C contact relays are provided for controlling door lock mechanisms or alarm signaling devices.
The relay contacts are rated at 2 A @ 30 V DC, dry contact configuration. Each relay has a Common pole (C),
a Normally Open pole (NO) and a Normally Closed pole (NC). When you are controlling the delivery of power
to the door strike, the Normally Open and Common poles are used. When momentarily removing power to
unlock the door, as with a mag lock, the Normally Closed and Common poles are used. Check with local
building codes for proper egress door installation.
Door lock mechanisms can generate EMF feedback to the relay circuit that can cause damage and premature
failure of the relay and affect the operation of the LP1501. It is recommended that either a diode or MOV
(metal oxide varistor) is used to protect the relay. Wire should be of sufficient gauge to avoid voltage loss.
From the Auxiliary output, the LP1501 can provide 12 V DC power for external devices, provided that the
maximum current is not exceeded. See
Listed Class 2 rated.
Diode selection
Diode current rating: 1x strike current.
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Diode breakdown voltage: 4x strike voltage.
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For 12 V DC or 24 V DC strike, diode 1N4002 (100V/1A) typical.
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2.11 Memory backup battery

The SRAM is backed up by a rechargeable battery when input power is removed. This battery should retain
the data for a minimum of three days. If data in the SRAM is determined to be corrupt after power up, all data,
including flash memory, is considered invalid and is erased. All configuration data must be re-downloaded.
Note: The initial charge of the battery may take up to 48 hours to be fully charged.
PLT-05243, A.1
Specifications for details. If a local power supply is used, it must be UL
14
HID Mercury™ LP1501 Controller
Installation and Specifications
June 2021